Friction drive apparatus.



D. LAB-SGN:

` FRICTIN DRIVE APPARATUS, l

APPLIGATMN HLED Nov. 15, 190e. Hmmm 00T. 1o, 190s.

Patented May l, 3909,

4 SHEETS-SHEET l.

MZQ/W C? l LARSGN; RPLTCN DETTE PYRTUS.

ALCAT FIXED 150V. 15, 1906. RENBWED GOT. 1Q, 1905i n zu E, LARSGN.

ERCTIGN DRIVE APPARATUS. APFLIOATION FILED NOV. 15, 1906. RENWED OUT, 10,'1908.

@Q1 ,6%. Patented May 1i, ww

4 SHEETS-SBBET 3.

'p25 in UNITED srnrns 'PATENT onnron i DAVID LARSN,` OF YONKERS, NEW'YORK.

FRIC'TION DRIVEV APPARATUS.

j v Specification of `Letters Patent.

Patentedmay 11, i909.

Application led November 15,'19'06, Serial No. 343,647; Renewed October 10, 1908. Seri'al No. 457,173.

To all 'whom it may concern:

Be it known that I, DAVID LARsoN, a sub ject of the King of Sweden, and a resident of Yonkers, in the county of Westchester and .5 State of New York, United States of America, have invented certain new and useful Improvements in Friction Drivef Apparatus, of which tl'iefollowing is a specification. My invention relates to a friction drive apparatus and especially to a new and useful combination of parts whereby -the rotary motion of a motor is'vtransr'nitted to a ro e at a greatly reduced sieed. Its object is to provide a sim le an inexpensive frictional l5 transmission cvice which i's eflicient in' its operation and which is practically noiseless. I will describe my invention in the followl.ing specification and point out the novel features thereof in claims. 120 Referringto the drawings, Figure 1 is a I front elevation of certain apparatus embodying my invention.' Fig. 2 1s a side elevation ofthe parts shown in Fig. 1. Fig. 3 isa section l plan View of some of the parts shown g.. 1, the section being taken through the line X-X in Fig, 1. Fig. 4 is a rear elevation, partly in section, of some' of the parts shown in Fig. 2. Fig. 5 isa sectional side elevation of the parts shown in Fig. 4, the 'section being taken through the line Y-Y of Fig. 4: Fig. 6 is -a diagrammatic re ifesentation of my invention ap lied to an e 'ec- Dtric elevator showing a simp e form Vof electrical connections-which may beused in carrying out my invention.

"Like characters of reference designate responding parts in all of the figures.

10 desi nates an annular driving ring .which is oosely mounted in the manner which will appear hereinafter. 11 designates the inner surface -ofthis annular ring which is a flat friction surface, Its, outer .surface is providedwith grooves 12 which are arranged to take'a rope or cable; 13, 13

COT-

designate iianges of this .driving ring which extend inwardly beyond the :dat friction surv,face 11 and Ioutwardly beyond the cable grooves 12..-

l20 designates a stationary pulley rigidly lmounted within the driving ringand mounted upon the shaft 21. I prefer to make the bearing of this ulley upon `the shaft 21 with anti'friction rol ers 22 -as shown. l23 'desi is preferably made fiat as shov'n,` and, 24, 24 designate flanges extending beyond this fric tion surface 23.

25, 25 designate anchor-bolts which are arranged to adjustably support the shaft 21, These a'nchoibolts are provided with adjusting screws 26, 26. y T he'upper ends of these anchor-bolts are connecte to the shaft- 21 and the lower ends are connected to a shaft 27 which is attached to a base 28.

30 and 40 are reversible motors of any desired type. ings as electric motors as that type of motor is particul'arly adaptable for use in. conjunc`- tion with my invention. 31 and 41- designate the shaftsl of these motors which are mounted upon stationary bearings 42 which are rigidly attached to the base 28.

35 and 45 designate tWc friction rollers I have shown them in the draw which are rigidly attached to the shafts 31.

and 41 and which are placed beta' een the iri- .ner surface 11 ofthe annular driving ring 10 and the outer surface 23 of the pulley 20, and' between the flanges 13, 13' of the annula'r driving ring and the flanges 24, 24 ofthe fixed pulley .20. The other ends of the shafts 31 and 41 may be provided with brake-pulleys 36l and 46 Whieh'are arranged to coact with braking-devices one of which I will now describe. j

50' designates the braking device which is usedq in conjunction With the brake-pulley 46. A similar device is arranged to act in l conjunction with the brake-pulley 36 but as these two mechanisms are similar in con-- struction I will describe but one of them specifically. This brake mechanism comprises 4 a solenoid 51 which is arranged to act upon a pairlof cores of magnetic material 52, 52. 53, 53 designate ybrake-shoe levers which are pivtally mounted at54,l 54 on standards 55,. n55 whichv are mounted upon the base 28. The other ends of these brake-shoe levers are connected together'by a rod 56. Springs 57,

57 areused in conjunction with this rod 5G' "to press thel brake-shoe levers together under va'fpressure which may be regulated by means adjustable nuts 58, 58. Before roceeding with the detail description of t e" other parts of my apparatus-I will briefly point out the operation of this brake 50. It may. be

seen that whenvthe machine is at resti-he' y .nates the outer surfaceof this pulley whic springs 57, 57 apply'the brakefshoe levers to t e brake pulley and causethesebrake-slioe elevator car 82 to which it is attached.

ynectd to the mainsi 91 and 92. electrically actuated reversing switch which I' y levers to hold the brake pulley 46 aiid consequently the shaft 41 and its connected parts. When a current of electricityY isv A passed through the solenoid 51 the latter is ypreferably provided with. rope or 'cable grooves 63 and anges 64, 64 as shown. 70 designates another braking apparatus which is also mounted upon the base 28. 1n this braking apparatus, 71 designates a solenoid 72 one of its magnetic cores; 73, 73 desigynate brake-shoe levers which are mounted upon the base 28 at 74, 74. 75 designates one of a pair of springs which s rings are arranged to act upon the brake-s loe levers 7 3,

' 73 and to apply them to ropes or cables which pass around the outer peripheryT of the driving ring in a manner which will be presdescribed. The pressurel with which the rake-shoes are applied m ay be regulated by means of an adjusting-nut 78 upon a threaded bolt 77. The general operation of i the braking apparatus 70 is similar to that previously described in conjunction-with the rake 80 ,designates cable or cables which, as shown in Figs. 1, 2 and 6, are led down past one side of the idler-sheave thence around and under the loose annular Y driving ring 10.

In this manner each of the cables surrounds a large part ofthe periphery of the driving ring 10. One end of this cable or each of these cables may be passed over a supporting sheave 81 and thence down torgn e other end of these cables may be run up and over a supporting sheave 83 and thence down to a counterweight 84 to which it i's attached.

In Fig. 6 and designate mains from a suitable source of electric supply which, af-

v ter passing through a main-switch 90, extend through 1nain-line conductors 91 and 92 and other wires to various ieces of apparatus in the manner which I Wil now briefly point out. 37 and' 47 designate the armatures of the niotors 30 and 40, and 38 and 48 designate their shunt field windings. l yThese ield windings are connected togetherin series and are con- 100 is an comprises two solenoids 101 and 102. The

upper terminal of each of these solenoids is I connected by a conductor 103 through the brake solenoids 51 and 61 te the main 92. The other terminal of solenoid 101 is connested by conductor 1`01^ to stationary contact 111 in a manually operated car-switch 110, and thc other terminal oll solenoid 102 is connected by the conductor 102A to stationary contact 112 in the car-switch. The

reversing switch 100 further comprises ccrtain movablerontacts to which the inotor armature tern-.mals are conncctcd. 'l'hc emergency or safety brake solenoid 71 has one of its terminals connected to the :nainline 91 by a. conductor 120. Its other tornrinal is connected by a condui-tor 121 to stationary contacts 113 and 114 in the carswitch 110 after passing through two automatic limit-stop switches 122 and 123. These li-nit switches are ,arranged to he opened by the car 82 striking against theni when it reaches thc lii its ol' its travel. l/Vhen the car reaches the upper limit ol" its travel it will strike against. a portion ol' li r.itswitch 122 and cause it to open the circuit; when the car reaches the lower li nit olI its travel it will strike against portion of limit-switch 123 and cause the latter to open the circuit.

As I have brieiiy pointed out the circuits, I will now briefly describe their operation. In theI car-switch 110 is a. pivoted contact lever 115 which may be moved l'roni its central po,- `sition to the left or right at the will of an operator in a car: Let us, for example, consider. that the operator moves this contact lever to the right to engage the contacts 111 and 113. Ile will thereby close acircuit vl'roni the positive main, through conductor 120, einergency or sal'ety brake solenoid 71, conductor121, limit stop-switches 122 and 123, contact 113,-which is now connected to contact 111--5 thence, through conductor 101A, reversing switch solenoid 1,01, conductor 103, brake solcnoids 51 and 61, to the main-line conductor 02 which is connected to the main. v will energize the three brake magnets and the reversing switch solenoid 10]. This solenoid, when energized, will cause the two left-hand movable contacts to be moved up a from the positive main to the right-hand terminal of motor armature 47 through the armatures 47 and 37 to the left-hand terminal ofinotor armature 37 which is now connected to the negative main through main-line conductor 92. As the shunt field windings of both lmotors, are permanently connected across the mains and as the arn'.atures are now also connected across the mains, the inotors will be energized and will cause the friction rollers 35 and 45 to be' rotated.

The circuit thus completed against the stationary contacts directly ove them and will thereby close a clrcuit These friction rollers are in contact with the inner surface of the loose annular ring 10 and with the outer surface of the stationary pulley 20. The i'rictional contact between these parts is n'xaintained by the upwardpull ol' the ropes or cables 80. motors will therefore be transn'iitted to the The rotation ot the loose annular driving ring and to the' car 82-and counterweight 84 through the cables 230. The car willtherefore be driven by the motors in one direction.

ear the operator may bring the contact lev'er 115 lback toward its central position.. The` first effect of this operation will be to cause the'conductor 115 to be moved off fronrthe stationary contact 111 onto the contact 111'., but it will remain in oontactwith ,the stal tionary Contact 113. The circuit, through the reversingswitch solenoid 101 and through the brake solenoids 51 and 61, will thereby be broken,l the current will be cut oif from-the motor armatures and the shaft brakes will b e applied. The circuit for the emergencybrake solenoid 71 is now from the positiye main through wire 120, solenoid 7'1, wire 121, limit stops 122,123, lever 115, contact 111', yandwire 125 to the negative main. A further movement offth'e car-switch lever 115 to its central position willcause it to be moved off from the stationary cdntaets 111 and 11?/ and the current,through the einergency brake solenoid 71, will thereby be cut oil" 4and the brake-shoe levers 73, 73 willbe applied to the cables 80. Vfhenever either 'of the automatic limit-stops 122 or 123 is opened a circuit through the motor armatures and all of the brake solenoids ,willfbe interrupted and the apparatus'V thereby brought to rest.. When it is desired'tohave the ear driven in the opposite direction the car-switch lever 115 may be moved to the left and the operation will be similar to that already described, `except that in this case solenoid 102 of the reversing switch will be energized and will causethe two right-hand nurvable contacts to be moved upward in sinihv a manner that thamotor armatures 37 and 47 vwill be conhected to the main-lines in the opposite direction.'

I have ycalled the Ybrake 71 an emergency or safety brakebeoause inthe usual operation of the elevator the brakes o'n the motor shafts may be used to bring the/apparatus to rest'. The brakin effect of the emergency brake is powerful ge the driving-cables and 'has a tendency not only to' hold the cables from further movement-but tol hold them ,tightly against the driving ring 10 and to prevent any slipping between the ropes and thc'driving ring.

but one motor, as for example, the motor 30, in which' caseI the friction roller 45 may be mounted upon an independentl shaft and may thereforebe merely an idler-pulley. I ir'efer, however, to use two motors, exceph or'very light duties, as the operation is smoother. wiring system may be arranged to control them on-'the series-parallel systei-n. .Moreover, when two motors arev used,`the appa-- When it is desired to stop the motion ofthe y cause it acts directlyon It is possible to construct this system with When two motors are used the I ratus is more'reliable because itcan still be used after one of the motors is lbroken down and the elevator or other driven apparatus may be continued in usepending repairs..

' I have shown this invention,as applied to direct currents but it is clearly applicable for use in conjunctiony with alternat;Y 'g currents. The Wiring system which I have llustrated is `an arbitrary arrangement and used to illustrate but one of many syst-emswhich may be used. I/Vhen twcimotors are. used it is possible to use the generated current of one of, them instoppingand both of them in start- 'ing the apparatus, and many othervariations can be, made by anyone familiar with the/art. I have but illustrated it' as applied to an elevator 'system a's this is one of its, ad.- vantageous uses, but it may, ofeoursefbe put to many Yother uses. By its use a lar te l s eed reduction may be obtained which .1s simple and efficient and which runs with almost nonoise.

Ywhat I claim is..-

1. A. loose annular ring,Y a stationary pulley .rithin said ringt'-.io friction pulleys he- 90" te. een the ring 'andthe stationary ulley, and' means for drivingfthe friction pul eys.

2. A loose annular ring, a stationary pulley withiitsaid ring, thro friction pulleys bey tween the ring .and the stationary pulley'f95 vciththeirvaxes below thovaxis offtho lilx'ed pulley, .and means for'drivingthe frietioi pulleys. 8. A loose annular-ring, a stationary pul- ,ley'uithin Asaid ring, two friction pulleys in 100 yfrlctionalcontact ith the inner surface of 'thefring and the outer surface of the stationary pulley, stationary bearings ,for the friction pulleys, and means for driving the friction ullcys. i i

4. 'A ase, a loose annular ring, a stationary pulley `within said ring adji'istably mounted upon the base; tuo lfriction pulley@ i frictional contact with the inner surface of trlie ring and the outer surface of the station- 1.10

ary pulley, stationary bearings for the fric.- tion pulleys, said stationary bearings being connected to the base, and means for driving the friction pulleys.

within said ring, bearings for! the pulley, said bearings being mounted' upon the base, 1 means for adjusting the position of said bearings relative to the base, tuto friction pulleys 'in frictional contact with the inner surface oi 12.0 thc ring and the outer surface of the irs't- A named pulley, stationary bearings for the f rictionpulleys, said stationary bearings bedriving the friction pulleys. 12 5 G. A base, a loose annular ring, a pulleyl within said ring, roller-bearings for' the pulley, said bearings being adjustably mounted upon thc base, tv-.'friction pulleys'in fric- 5. A base, a looseannular ring, a pulley 1154 ing connected to the base, andnieans for f tional contact u ith the inneisurfacel of the ary pulley within sail ring, roller-bearings for the pulley, said bearings being adjustablymounted upon the base, two friction pulleys in frictional contact with the inner surface of the ring and the outer surface of the stationary pulley, `with their axes below the axis of the stationary pulley, stationary bearings for the friction pulleys, saidbearingsbeing connected to the base, and means for driving the friction pulleys.

8. A hoisting cable, a loose annular driving ring receiving the cable, a stationary pulley within said ring, two friction pulleys betWV en the ring and the stationary pulley, a" d n'leans for driving the friction pulleys.

9. A hoisting cable, a loose annular driving ring receiving the c` ble, a stationary pulley within the ring, tivo friction pulleys in frictional contact it ith the inner surface of the ring and the outer surface ofthe stationary pulley, stationary bearings for the friction pulleys, and ineans for driving the friction pulleys.

10. A loose annular rino', a pulley within said ring, two friction u leys between the ring and the first-nainet pulley, a shaft for each of said friction pulleys, and a inotoi` for cach of said shafts.

1l. A hoisting cable, a loose annular driving ring receiving the cable, a pulley within said ring, two friction pulleys in frictional contact with the inner surface of the rin and the outer surface of said pulley, a shaft for each of said friction pulleys, stationary bearings for said shafts, and two inptors, one of which is connected to one of the friction pulley shafts andthe other of which is connected to the other of the friction pulley shafts.

12. A hoisting cable, a loose annulardriving ring receiving the cable, a stationary p'ulley Witbin the ring, two friction pulleys in frictional contact with the inner surface of vthe ring and the outer surface of the pulley,

a shaft for each of said friction pulleys, stationary bearings for said shafts, and two niotors, one of which is connected to one of the friction pulley shafts and the other of which is connected to the other of the friction pulley shafts, with their axes below the axis of the stationar pulley.

13. A lbose annular ring, a pulley within said ring, twjo friction pu leys between the ring and the first-named pulley, means for driving one of the friction pulleys, and a brake arranged to act upon the loose ring.

14. A hoisting cable, a loose annular driving ring receiving the cable, a pulley Within said rin two friction pulleys between the ring an the first-named pulley, means for.

the outer surface of said ypi1lley,a sha senese driving the friction pulleys, and a brake arranged to engage said cable and to hold the driving ringll l5. A hoisting cable, a loose annular driving ring receiving the cable, a pulley Within said ring, two friction pulleys in frictional contact with the inneifsurfaceof the ring lind the outer surface of the pulley, a shaft for .each of said friction pulleys, stationary bearings for said shafts, two motors, one of which is connected to one of the friction pulley shafts and the otherof which isconnected to the other ofthe friction pulley shafts, and a brake arranged to engage said cable and to hold the driving ring. ,y

16. A hoisting cable, a loose annular driving ring receiving the cablefa pulley within said ring, two friction pulleys in frictional contact with the inner surface of the rin and the outer ,surface of said pulley, a sha for each of said friction pulleys, stationary bearings for said shafts, two motors, one of which is connected to one of the friction pulley shafts and the other of which is connected to the other of the friction pulley shafts, a brake for each of said frictionpulley shafts and a brake arranged to engage with the cable and to hold the driving ring.

17. A hoisting cable, `a looseannular driving ring receiving the cable, a pulley Within said ring, two friction pulleys in frictional contact with the inner surface ofthe ring and t for each of said friction pulleys, stationary bearings for said shafts,'tWo electric motors, one

"of which is connected to one ofthe friction pulley shafts and the otherA of which is connected to the other of the friction ulley shafts, an electric brake' for each of said pnl ley shafts, and an electric brake arranged to engage With the cable and to hold the driving rin Y.

1g8. A hoisting cable, a loose annular driving rin@r receiving thecable, a stationaryp'ulley Wittliin said ring-tivo friction pulleys in' frictional contact Withthe inner surface of the ring and the outer surface of the stationary pulley, a haft for each of said friction pulleys, stationa y bearings for said shafts, two electric motors, one of which is connected to oner of the friction pulley shafts and the other of which is connected to the other-of the friction ulley shafts, an electric brake for each of sani pulley shafts, an electric brake anranged to engage with the cable and to hold the driving ring, and a wiring system for `said motors and' brakes.

.19. A hoisting cable, a loose annular driving ring receiving the cable, a stationary idler pulley for guiding said cable, a ulley Within the driving ring, two friction pu leys between the ring and thev said ullle'y, and means' for driving the friction pulleys.,

20.' A hoisting cable, a base, a loose annular driving' ring receiving alle cable, an idler shafts and the other of which is connected driving the friction pulleys.

the idler-pulley in a position permanently iXedieelative to the base, a stationary pulley within the ring, bearings for the stationary pulley, means for adjusting said bearings relative to the base, two friction pulleys in frictional Contact with the inner surface of the loose ring'a'nd the outer surface ofthe stationary pulley, bearings mounted 'upon the base for said frictionpulleys, and means for 21. A hoisting cable, a movable member connected therewith, a looseannular driving ring receiving the cable, a stationary pulley within said ring, two frictiom pul ys be'- tween the ring and the stationary ulley, and means for driving the friction pu eys.

22. A hoisting cable, a movable member connected therewith, a aose annular driving ring, receiving the cable, a pulley within the rin ,two friction lpulleys in frictional contact wit for said shafts, and two motors, one of which is connected to. one of the -'friction pulley to the other of the friction pulleylshafts.

23. A hoistingcable, a mova e member connected therewith, a loose annular driving ringreceiving the cable, a stationary pulley waliin said ring, two friction pulleys in frictional contact with the inner surface of the rin(T and the outer surface ofthe stationary pulley, a shaft foreach of said friction pulleys, stationary bearings for said shafts, two mo# tors, one of which. is connected to one of the friction pulley shafts and the other of which is connected to the other. of the friction pulley shafts, a. brake for each of said friction pulley shafts, and abrake arran ed to en- .fgagewith the cable and to-hold t e driving 24. A hoisting cable, a movable member connected therewith, a base, a loose annular driving ring receiving the cable, an idler-pulley for guiding said cable, a bearing for the the-inner surface of the ring and the. outer surface of said pulley, a shaft for each' of said friction pulleys, stationary bearings idler-pulley in a position permanently vfixed relative to the base, a stationary pulley within the ring, bearings for the stationary pulley, means for adjusting. said bearings relative to the base, two friction 'pulleys in frictional contact with 'the inner surface of the 1 loose ring and the outer surface ofthe fixed pulley, bearings mounted upon the base. for said frictionpulleys, and means for driving `the friction pulleys.

'25. The combinationwitha base, .of a pu-l'v ley' mounted 'above the base and -carried thereby, means for adjusting'the pulley to ward and away from the base, an annular ring surrounding the pulley, and a drive pulley between the ring and the rst-named puley.

26. The combination with a base, of' a shaft mounted therein, anchor bolts carried by the shaft, a bearingshaft carried by the anchor bolts, apulley mounted on the bearin shaft, an annular ring surroundingthe pu ley, and friction drive pulleys between the ring and the rst-named pulley. 27. The combination with a loose annular driving ring, of a stationary pulley within the rin two i? an( the stationaryA pulley, means for driving the friction pulleys, and a brake ap lied to press the ring against the friction pu leys.

28. Thefcombination'with a base, of a stationary pulley mountedthereon, a loose an# nular 'ring surrounding `the pulle two friction drive pulleys in contact wit theinner surface of the rin -and the outer surface o'f the first-named pu ley and located below the center lof the f'ring, means for drivin .said

DAvrnLAnsoN.

i l'rlitnesses:` y j ERNEST W. MARSHALL,

Enw. LUCE.

riction' pulleys' between the ring 

